Green chromium compound and a process of making same.



'and' the liquid evaporated to 50() parts. the cooled liquid 150 parts common salt are added and the mass is allowed to stand for 'some time, whereby the pure chromium compound separates in form of a Agreen pulp of crystals and canbe isolated 'with a goodl yielding by filtration, washing and drying. The thuslprepar'ed fchromlum compound has the same properties as the heretofore described.

Instead of chromium yluorid'othersalts of chromium;

foregoing examples.

What we claim is 1. The described process for the .preparation of a new 'chromium compound consistingr in'heating a mixture of aqueous solutions of a chromium salt and of the technical orthooXyazo -dyestu derived from 4: :2 :1-nitrod-iazophenol and 1:8 :3 4:t3-*aminonaphtholdisulfonic acid, separating the remaining -inorganic residue by iltration, evaporating the liltered blue solution, separating from this lat-ter by crystallization a red, diilicultly soluble chromium compound, delivering the solution fromthis latter by .filtration and isolating the new green chroseparated. by 'sucresidue, the latteras chromium chlorid,4 chro. mium sulfate, etc., can be employed in the eration and mium compound from its' remaining bluegreen solution.

/ The described' .process for the manu facture of a green chromiumcompound, consisting in heating themixtur'e of' aqueous solutions of a chromium salt and of the pure orthooxyazo dyestu 'derived from 45:2 :l-nitrodiazophenol and- 1 :8 :3 :i5-amino naphtholdisulfonic acid,- separating1 the rcmaining inorganic residue by filtration and isolating the new chromium compound fram its thus obtained solution.

3., As a new article of manufacture t e described green chromium compound of the orthooxyazo dyestuE derived from 4:221- nitrodiazophenol and '1:8z3z6-aminonaph-- tholdisulfonic' acid, dissolving in concen' trated sulfuric acid with a red-blue coloration and in alcohol with 4a blue-green coldyeing.' from its green colored aqueous solution the animal fibers green tints of prominent fast-ness to light.

' 1n witness whereof we have hereunto signed our names this 19th day of Qctober,

1915, in the presence of two subscribing witnesses.-

DR. GADIENT ENGL Dn. ARMIN GROB. FRITZ STRAUB.

Witnesses:

ARN OLD Zunnm. AMAND RETTEY. 

